A study conducted by a University of California at Davis professor contends that occupational lung diseases carried direct and indirect costs of an estimated $8.5 billion in 2001 and warrants intervention.The study, by J. Paul Leigh, PhD, professor of health economics at the university's School of Medicine, was published in CHEST, the peer-reviewed journal of the American College of Chest Physicians (ACCP).Conditions like chronic obstructive pulmonary disease (COPD) and asthma repre
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